larkin



(No Model.) heets-Sheet 1. D. LARKIN. ROLLING MILL FOR HOOP OR STRAP IRON.

No. 409.048. Pate nted Aug. 13, 1889.

v INYEN'IUFV WITNES'EEE (No Model.) 2 Sheets-Sheet 2.

D. LARKIN. ROLLING MILL FOR HOOP OR STRAP IRON. No. 409,048. Patented Aug. 13, 1889.

WIINEEEEE INYENUFV Qu@ mmm Qy i UNITED STATES PATENT QFFICEQ DAVI D IARKIN, OF TJTSBURG, PENNSYLVANIA, ASSIGNOR TO I IIMSELF, JOHN B. LARKIN, AND FRANK l). LARKIN, ALL OF SAME PLACE.

ROLLlNG-Ml'LL FOR HOOP OR STRAP IRON.

SPECIFICATION formng part of Letters Patent No. 409,048, dated August 13, 1889. Application filed April 5, 1889. Serial No. 3OG,12Z. (Ne model.)

To all whom it may conccrn:

Be it known that I, DAVID LARKTN, a citizen of theUnited States, residi ng at Pittsburg, in the County of Allegheny and State ot' Pennsylvania, have invented certain new and useful Improvements in Rolling-Mills for Strap, Hoop, or Band Metal; and I do herebydeclare the following to be a full, clear, and exact description of the invention, reference bei n had to the aeeompanying drawings, which form part of this specitication.

My invention has relation to the manufacture of hoop, cotton-tie band, or other kinds or qualities of meta1-work produced by the reduction of. the material 'from the billet to a lon g narrow and thin strip by passin g through successive or a eontinuous train of redueingrolls.

The object oi' my invention is to greatly facilitate the reduetion of the metal by ebviating and overconing the dilliculties heretofore experienced in handling or working the material during its progres-'s through the rolls and to thereby reduce 'the cost ot' production as well as well as improve lthe texture of the finished product. i

IIeretofore, by reason of the frail tcxture, light gage, and semi-liquid condition ot' the metal during the process of reduction, it has been impossible, without manual assistance and skillful manipulation, to eii ect a delivery of the end of the blank after energing` from one set of rolls to the slot or opening in the next set, While even after the delivery has been accemplis'hed the exeess of material between the rolls, resulting from the elongation of the blank, buckles, Vibrates, Wraps, and sways about in a zigzag course, so as to become practically unnanageable, thus rendering' the nanutacture of the grades of metal referred to inpraeticable with continuous rolls and necessitating the employment of hand-labor and the reduction ot' power and motion.

According to the method or process heretofore praeticed for the reduction o imtal from the billet to the long strip, band, or hoop blank the material has been passed alternately to and fre and from right to left or left to right between a single pair ot' rolls or shifted from one pair to the other. This operation is slow and tedious and subject to many difliculties, which need not beenumerated.

Accordingto the object ot my im 'ention I purpose embracing a number oi? sets or trans of rolls located at regular or irregular inter- Vals of space with direct reference to the acconunodation of the aceumulation of? or surplus metal that gathers between the rolls durin the reduetion and geared or interlocked so as to feed the material with a continuos notion in one direction from the start to the finish.

My invention or improvement. in the art of rollin or redueing the metal lies in the special provision I have made to stit'ten or braee the material during the intermediate stages of the process, so as to facilitate and insure its proper delivery from one set of rolls to the other. This provision consists in the cmstruetion of a train of rolls 'for imparting to the blank a laterally-curveddished, dished and eoneaved, oreorrugated shape, said train comprising two 01.' more sets ol' intermediate rolls ot' the desi'ed configuration, male and fenale,whereby the surplus or accumulation between the rolls will. be rendered suiliciently rigid and sell'- sustaining to prevent 'nndue buekling, swaying, twisting, or disiortion, and insure delivery from one set ot' rolls to the suceeeding set, the last set being se constructed as to reduce the dished, concave, or corrugated material to a flat surface, as required in finishing'.

Incidental to the sets ot rolls eonstituting; a continuous train or nill and adapted to conditions stated, I purpose using and arranging between the' sets ot' rolls which inpart to the stock a concave or dished 't'orm and maintain this shape a series ot' horizontal platforms, tables, planes, or guides, which may be dished or eurved to contorn to the dish or eurvature of the, blank or corresponding t'emale rolls, and which. are adapted to assist by their guidinr properties and positions the delivery ot' the metal i' rom one set ot' rolls to another, said plattorms or planes eonstituting iu effeet a continuous track, guide, or cond uit for thcpassage and guidanee ot' the naterial from the starting' to the final or [inish- 1' ng pass.

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In the acconpauying drawings,1`igure 1 is avertical longitudinal section of a rolling-mill or eontinuous train eonstructed and adapted for carrying,` my invention into effect. Fig is a front elevation of a set of rolls, respeetively male and female, construeted and adapted to dish or eoneave the blank. Fig. 3 is a perspective YCW of a section of the blank having the dished or coneave form. Fig. 4 is a similar View of a section of the finished stock or blank. Fig. 5 is a face View of the rolls forreducing the fin. Fig. 1 of the drawings shows five sets of rolls; but any suitable or convenient number may be enployed.

The rolls are mounted in housings in the ordinary way and provided with such appu rtenances as are common and necessary in continuous rolling-nills. In practice the dishing of the blank should begin aft( r the first pass and should be gradual, and may even advantageously begin with the first set of rolls A. The dishin, or concavine may, however, begin with any set of rolls and continue either uniformly or by gradual increase until the last set E has been reached. All the intermediate sets 13 U D will usually be shaped to dish or bend the blank laterally, and the conformat-ich or shape of the rolls is adequately shown in Fig. 2, one of the rolls being circunfcrentially grooved, as shown at a, and the other eorrespondingly re enforced or llanged, as shown at a'.

It should be understood that I do not contiue myself to any particular bend, dish, 01' other lateral detleetion of the metal from a horizontal plane, but show the eoneave dishig` or segmental shape merely as an illustration of the general idea or principle upon which my invcntion is based.

ll I .T designate, respectively, the planes, tables, or euides located between the sets of rolls and grooved longitudinally to receive and uide the metal from one set to another. These grooves are of a shape, width, and depth conformable to the eurved or dished varying shape, width, and depth of the stock, and require no detailed description.

In rollng with the apparatus above described a fine fin or bead gradually gathers or is tormed on the edge ot the blank, and this should he disposed of before the blank is finally straightened or fiattened.

I make adequate provision for the reduction and ohlitcration of the fin hy use of a pair of rolls which may he located between the last reducing set and the fiattening-rolls. The lin-rcduciug rolls are shown in Fig. 5, and consist of a plain roll G and a slightlygrooved roll ll'. The groove L is reetangular and nearly equals in width the desired width of the finished product. 'l`hellank,leiugconslmeted laterall y, by reason of itshend or dellected l'orm easily enters the groove,

and by th compression orimpact of theplane has its roug'h or finned edges forced into the angles of the groove and the fin or head compressed into the body of the blank or reduced to a condition contormable to the requiremeuts of finish and good workmanship.

lVhile I have shown and described the rolls as having each a single pass-groove, it is ob- Vious that the rolls may be grooved at intervals se as to form several separate and distinct grooves, and that the tables may he of suitable form and width so that several blanks may be simultaneously reduced.

l-laving described my invention, What I claim, and desire to secure by Letters Patent, 1s-

1. A eotinuous rolling-mill for the production of hoop or strap metal, comprising several sets of reducing-rolls, of which two or more sets have their rolls respectively grooved and flanged, the grooves and flanges of one set being more abrupt than those of the precedin, set and formim: a pass of less depth, snbstantiily as descioed.

2. A continuous ro1ling-mill forthe production of hoop or strap metal, comprising a set of rolls intermediate in the train of which set one roll is dished or grooved and the other flanged, whereby a coneaving, eorrugating, or defiecting pass is formed for the purpose ol' dishing', corrugating, orlaterally delectin; the metal in its course, snbstantally as described.

In a continuous rolling-nill for the production of hoop or strap metal, the combination, with one or more sets of rolls intermediate in the train, of which one roll is grooved or dished and the other corrcspondingl y fianged, of a set of plain finisling-rolls terminating the train, substantially as described.

4. ln a eontinuous rolling-mill for the production ol' hoop or strap metal, comprising* one or more sets of laterally-defieeting, dishing, or corrugating rolls and a set of plain finishing-rolls, a set of fin-redueing, rolls located in advance of the finishing-rolls and eonprising a plai'` roll (E and u slightly-grooved roll ll, the groove L being of rectangular form, substantially as described.

5. In a eontinuous rolling-mill l'or the production of hoop er strap metal, the combination, with a train in which oneor more sets have dished or corrugated defieeting-passes, of the rooved tables or guides III, ((EC.,lOCLtC(1llC- tween the respective sets of rolls, substantially as described.

In testimony that I claim the loregoing I have hereunto set my hand this 25th day of March, 1889.

DAVID LARKIN.

\\"itnesscs:

WM. ill. (JI'AMnnns, JOHN NCGILL.

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